build: bump openai in /src/App in the backend-deps group

Bumps the backend-deps group in /src/App with 1 update: [openai](https://github.com/openai/openai-python).


Updates `openai` from 1.98.0 to 1.99.1
- [Release notes](https://github.com/openai/openai-python/releases)
- [Changelog](https://github.com/openai/openai-python/blob/main/CHANGELOG.md)
- [Commits](openai/openai-python@v1.98.0...v1.99.1)

---
updated-dependencies:
- dependency-name: openai
  dependency-version: 1.99.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: backend-deps
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/App/requirements-dev.txt

@@ -1,6 +1,6 @@
 -r requirements.txt
 azure-identity==1.23.1
-openai==1.98.0
+openai==1.99.1
 azure-search-documents==11.6.0b12
 azure-storage-blob==12.26.0
 python-dotenv==1.1.1

src/App/requirements.txt

@@ -1,7 +1,7 @@
 # Core requirements
 azure-identity==1.23.1
 # Flask[async]==2.3.2
-openai==1.98.0
+openai==1.99.1
 azure-storage-blob==12.26.0
 python-dotenv==1.1.1
 azure-cosmos==4.9.0